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— Look! The man at the gate ________ be our headmaster.He is always standing there in the morning.

— No, it ________ be him.He is holding a meeting in the office now.

A. must; can't

B. must; mustn't

C. can't; can't

D. can't; mustn't

九年级英语单选题中等难度题

少年,再来一题如何?
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